Zipp's 858 NSW Carbon Disc Brake Wheel is tubeless ready and optimized for aerodynamic advantages that keep us speeding across the flats and blasting out of corners. Its tubeless setup means we'll be seeing increased cornering grip and reduced rolling resistance, and an 18mm internal rim width allows for running tires up to 38c. Zipp's proprietary Sawtooth profile features an undulating 77/82mm rim depth, shaped for top-performing crosswind stability and speed, and biomimicry technology reduces drag and side force.